package file;

import java.io.File;
import java.util.HashMap;

public class file05 {
    public static void main(String[] args) {
        File file = new File("E:\\xiangmu\\File");
        HashMap<String, Integer> hm = new HashMap<>();
        getCount(hm,file);
        System.out.println(hm);
        
    }

    private static void getCount(HashMap<String, Integer> hm, File file) {
        File[] files = file.listFiles();
        for (File f : files) {
            if(f.isFile()){
                String fileName = f.getName();
                String[] fileNameArr = fileName.split("\\.");
                if(fileNameArr.length == 2){
                    String fileEndName = fileNameArr[1];
                    if(hm.containsKey(fileEndName)){
                        Integer count = hm.get(fileEndName);
                        count++;
                        hm.put(fileEndName,count);
                    }else {
                        hm.put(fileEndName,1);
                    }
                }
            }else {
                getCount(hm,f);
            }
        }
    }


}
